Well, the Hijri date 1 Rajab 1403 corresponds to the Gregorian date Thursday, 14 April 1983. This date lies in the seventh month of the Hijri year 1403 AH, which is Rajab of 1403 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1403/07/01 is calculated using the Umm Al-Qura calendar and the sighting of the moon. One thing to remember is that this Arabic date may occur on different Gregorian date depending upon the region and country and obviously the moon.
If you are still not sure about the date then you can use our Arabic date converter.
The following is the conversion of the Gregorian date 14 April 1983 to its equivalent Arabic date.
The following is the conversion of the Arabic date 1 Rajab 1403 AH to its equivalent Gregorian date.
وَلَقَدْ قَالَ لَهُمْ هَٰرُونُ مِن قَبْلُ يَٰقَوْمِ إِنَّمَا فُتِنتُم بِهِۦ ۖ وَإِنَّ رَبَّكُمُ ٱلرَّحْمَٰنُ فَٱتَّبِعُونِى وَأَطِيعُوٓا۟ أَمْرِى
And Aaron indeed had told them beforehand: O my people! Ye are but being seduced therewith, for lo! your Lord is the Beneficent, so follow me and obey my order.
Surah Taa-Haa(20:90)